JP2009052429A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll compressor improved in suction efficiency by suppressing heat conduction to a suction port to suppress the rise of a suction temperature. <P>SOLUTION: A working fluid flowing through a stator part 34 does not flow into a main bearing part 11 and a fixed scroll end plate, and is discharged to the outside of the compressor since a discharge pipe 2e is installed between the stator part and the main bearing part 11. Therefore, even during a high speed operation and a high pressure difference operation in which the temperature of the working fluid is high, the heat conduction from the hot working fluid to the main bearing part and the fixed scroll is suppressed, and the rise of the temperature of the suction port is suppressed. Consequently, the compression efficiency can be improved. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a scroll compressor used in a cooling device such as a cooling / heating air conditioner or a refrigerator, or a heat pump type hot water supply device.

Many conventional configurations of this type of scroll compressor have been proposed (see, for example, Patent Document 1). FIG. 4 shows a conventional scroll compressor described in Patent Document 1. In FIG. In FIG. 4, the scroll compressor has a spiral wall body standing on one side surface of the end plate 2b, and is fixed on one side surface of the fixed scroll 2 fixed at a fixed position and the other end plate 3a. The rotating scroll 3 is supported so as to be capable of revolving orbiting while preventing the rotation by engaging the walls with each other. The fixed scroll 2 has a discharge port 2d, and the working fluid is discharged out of the compressor through the discharge pipe 2e.
JP 2006-266170 A

  However, in the conventional configuration, the discharge temperature becomes very high during high-speed and high differential pressure operation, and the working fluid temperature in the muffler also becomes high, so heat conduction from the hot working fluid to the fixed scroll end plate occurs. However, as the temperature of the fixed scroll end plate rises, the suction port is also heated, the suction temperature of the working fluid rises, and the compression efficiency may decrease.

  An object of the present invention is to solve the above-described conventional problems, and to provide a highly efficient scroll compressor that suppresses heat conduction to a fixed scroll and suppresses heating of a suction port.

  In order to solve the above-mentioned conventional problems, the scroll compressor of the present invention has a discharge pipe installed between the stator portion and the main bearing portion.

  As a result, even during high-speed and high differential pressure operation where the discharge temperature becomes high, heat conduction from the high-temperature working fluid to the main bearing and fixed scroll is suppressed, and the temperature rise of the suction port is suppressed, resulting in a decrease in compression efficiency. Can be suppressed.

  The scroll compressor of the present invention can improve the performance of the scroll compressor by suppressing heat conduction to the suction port and suppressing an increase in the suction temperature of the working fluid.

  In the first invention, since the discharge pipe is provided between the stator portion and the main bearing portion, the working fluid that has passed through the stator portion is discharged outside the compressor without flowing into the main bearing portion or the fixed scroll end plate. Even during high-speed and high differential pressure operation where the working fluid temperature becomes high, heat conduction from the high-temperature working fluid to the main bearing and the fixed scroll can be suppressed, temperature rise of the suction port can be suppressed, and compression efficiency can be improved.

  In the second invention, by providing the discharge pipe at a position opposite to the suction port by 180 degrees, the flow of the high-temperature working fluid to the vicinity of the suction port can be eliminated, the temperature rise of the suction port is further suppressed, and the compression efficiency is improved. It can be improved.

  According to a third aspect of the present invention, a heat insulating material is provided on a surface of the main bearing portion that faces the motor rotor portion, thereby suppressing heat conduction from the working fluid to the fixed scroll through the main bearing portion, thereby effectively increasing the temperature of the suction port. And the compression efficiency can be improved.

  In the fourth invention, since the heat insulating effect can be enhanced by configuring the heat insulating material with a hollow ceramic, heat conduction from the high temperature working fluid to the fixed scroll and the main bearing portion is further suppressed, and the suction port The temperature rise can be effectively suppressed and the compression efficiency can be improved.

  According to a fifth aspect of the present invention, even when the working fluid of the compressor is carbon dioxide, the heat conduction from the hot working fluid to the fixed scroll is suppressed during the high speed / high differential pressure operation where the discharge temperature becomes high, and the suction port Temperature rise can be suppressed, and a decrease in compression efficiency can be suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a scroll compressor according to the first embodiment of the present invention. FIG. 2 is a top view of the scroll compressor according to the first embodiment of the present invention. The operation and action of the scroll compressor configured as shown in the figure will be described below.

  As shown in FIG. 1, the scroll compressor according to the present invention includes a main bearing portion 11 of a crankshaft 4 fixed by welding or shrink fitting in an airtight container 1, and a fixed bolted on the main bearing portion 11. A scroll-type compression mechanism 2f is configured by sandwiching the orbiting scroll 3 meshing with the fixed scroll 2 between the scroll 2 and the rotation of the orbiting scroll 3 between the orbiting scroll 3 and the main bearing portion 11 is prevented. A rotation restricting mechanism 14 such as an Oldham ring that guides the orbital movement is provided, and the orbiting scroll 3 is eccentrically driven by the eccentric shaft portion 4a at the upper end of the crankshaft 4, thereby causing the orbiting scroll 3 to move in a circular orbit. As a result, the compression chamber 15 formed between the fixed scroll 2 and the orbiting scroll 3 becomes smaller while moving from the outer peripheral side to the central portion, and is sealed. The working fluid is sucked and compressed from the suction pipe 16 communicating with the outside of the container 1 and the suction port 17 on the outer peripheral portion of the fixed scroll 2, and the working fluid that exceeds the predetermined pressure is discharged from the discharge port at the center of the fixed scroll 2. From 2d, the discharge valve 19 is pushed open and discharged into the muffler 21 repeatedly.

  There is a sliding partition ring 78 disposed on the main bearing portion 11 on the back surface portion of the orbiting scroll 3, and the high pressure portion which is an inner region of the sliding partition ring 78 by the sliding partition ring 78 while performing the orbiting motion. And a back pressure space set to an intermediate pressure between the high pressure and the low pressure, which is the outer region. By applying pressure on the back surface, the orbiting scroll 3 is stably pressed against the fixed scroll 2, reducing leakage and performing stable circular orbit movement.

  Further, the fixed scroll 2 includes a back pressure adjusting valve 9 that controls the pressure in the back pressure space 29 on the back surface of the orbiting scroll 3.

  The working fluid discharged into the muffler 21 passes from the discharge flow path A31 provided in the fixed scroll 2 through the discharge flow path B22 provided in the main bearing portion 11 and passes through the discharge flow path C32 provided in the motor rotor 35. Then, it is reversed and discharged from the discharge pipe 2e to the outside of the compressor through the discharge flow path D33 provided in the stator 34.

Since the working fluid that has passed through the stator 34 takes heat away from the motor rotor 35 and the stator 34, the working fluid becomes high temperature. However, since the high temperature working fluid after passing through the stator 34 does not flow into the main bearing portion 11 or the fixed scroll 2, the main bearing portion 11 or the fixed scroll 2 is not heated, and therefore the suction port 17 is not heated. The rise in the intake temperature can be suppressed. Therefore, compression efficiency can be improved.

  Since the discharge pipe 2e is installed at a position opposite to the suction port 17 by 180 degrees, the hot working fluid flows through the position farthest from the suction port 17. Accordingly, the suction port 17 is also hardly heated, and an increase in the suction temperature of the working fluid can be suppressed. Therefore, compression efficiency can be improved.

  In addition, as the temperature of the fixed scroll 2 rises, the end plate of the fixed scroll 2 and the lap portion of the fixed scroll 2 are prevented from being deformed by thermal expansion, and the turning scroll 3 and the fixed scroll 2 are brought into contact with each other to increase input or cause seizure. Occurrence can be prevented.

  Further, since the thermal expansion of the wrap of the fixed scroll 2 is reduced, the axial clearance between the fixed scroll 2 and the orbiting scroll 3 can be set narrow, so that leakage during low speed / low differential pressure operation can be reduced and volume efficiency can be improved. .

(Embodiment 2)
FIG. 3 is a longitudinal sectional view of the compression mechanism portion of the scroll compressor according to the second embodiment of the present invention.

  In the present embodiment, a heat insulating material 26 is provided on the surface of the main bearing portion 11 that faces the motor rotor 35 portion.

  The operation of the scroll compressor in the second embodiment is the same as that in the first embodiment.

  Since the working fluid that has passed through the stator 34 takes heat away from the motor rotor 35 and the stator 34, the working fluid becomes high temperature. Since this high-temperature working fluid collides with the main bearing portion 11 and is discharged from the discharge pipe 2e, heat conduction from the working fluid to the main bearing portion 11 is suppressed by the heat insulating material 22. Therefore, the main bearing portion 11 and the fixed scroll 2 are not easily heated, and heating of the suction port 17 can be suppressed, so that an increase in the suction temperature of the working fluid can be suppressed. Therefore, compression efficiency can be improved.

  In addition, if the coating material containing the hollow ceramic with a high heat insulation effect is used, since it can apply | coat to the main bearing part 11, the heat insulating material 22 can be installed easily.

  As described above, the scroll compressor according to the present invention can suppress heat conduction to the suction port, and is not limited to a working fluid as a working fluid, but includes an air scroll compressor, a vacuum pump, a scroll type expander, and the like. It can also be applied to other scroll fluid machinery applications.

The longitudinal cross-sectional view of the scroll compressor in Embodiment 1 of this invention The top view of the scroll compressor in Embodiment 1 of this invention The longitudinal cross-sectional view of the scroll compressor in Embodiment 2 of this invention Sectional view of a conventional scroll compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Fixed scroll 2b Fixed scroll end plate 2d Discharge port 2e Discharge pipe 2f Scroll compression mechanism part 3 Orbiting scroll 3a Orbiting scroll end plate 4 Crankshaft 4a Eccentric part 9 Back pressure adjustment valve 11 Main bearing part 14 Rotation restriction mechanism 15 Compression chamber 16 Suction pipe 17 Suction port 19 Discharge valve 21 Muffler 22 Discharge flow path B
23 Rotor Through Hole 24 Stator Through Hole 25 Mechanical Upper Space 26 Heat Insulating Material 28 Radiating Fin 29 Back Pressure Space 30 High Pressure Part 31
32 Discharge channel C
33 Discharge channel D
34 Stator 35 Motor rotor 78 Sliding partition ring

Claims (5)

The fixed scroll where the spiral wrap rises from the end plate and the orbiting scroll are meshed, and when the orbiting scroll is rotated along a circular orbit under the restriction of rotation, the compression chamber is formed by moving while changing the volume. Then, after the working fluid sucked from the suction pipe flows into the compression chamber from the suction port and is compressed in the compression chamber, after passing through the discharge port, the outer peripheral portion of the fixed scroll end plate, the main bearing portion, the motor rotor portion, A scroll compressor having a flow path that sequentially passes through a stator portion and is discharged from a discharge pipe to the outside of the compressor, wherein the discharge pipe is provided between the stator portion and the main bearing portion. The scroll compressor according to claim 1, wherein the discharge pipe is provided at a position facing the suction port by 180 degrees. The scroll compressor of Claim 1 or Claim 2 which provided the heat insulating material in the surface which faces the motor rotor part of a main bearing part. The scroll compressor of Claim 3 which comprised the heat insulating material with the hollow ceramic particle | grains. The scroll compressor according to any one of claims 1 to 4, wherein the working fluid is carbon dioxide.